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LTC7803 Datasheet(PDF) 1 Page - Analog Devices |
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LTC7803 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 44 page  LTC7817 1 Rev 0 For more information www.analog.com Document Feedback DESCRIPTION TYPICAL APPLICATION 40V, Low IQ, 3MHz, Triple Output Buck/Buck/Boost Synchronous Controller The LTC®7817 is a high performance triple output (buck/ buck/boost) synchronous DC/DC switching regulator con- troller that drives all N-channel power MOSFET stages. Its constant frequency current mode architecture allows a phase-lockable switching frequency of up to 3MHz. The LTC7817 operates from a wide 4.5V to 40V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC7817 can operate from an input supply as low as 1V after start-up. The very low no-load quiescent current extends operating run time in battery powered systems. OPTI-LOOP® com- pensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC7817 features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. The LTC7817 synchronous boost Pass-Thru capability minimizes losses in automotive start-stop applications. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258. FEATURES APPLICATIONS n Dual Buck Plus Single Boost Synchronous Controllers n Low Operating IQ: 14μA (14V to 3.3V, Channel 1 On) n Outputs Remain in Regulation Through Cold Crank Down to 1V Input Supply Voltage n Wide Bias Input Voltage Range: 4.5V to 40V n Buck and Boost Output Voltages up to 40V n RSENSE or DCR Current Sensing n Pass-Thru™ Operation: 100% Duty Cycle for Boost Synchronous MOSFET n Programmable Fixed Frequency (100kHz to 3MHz) n Phase-Lockable Frequency (100kHz to 3MHz) n Selectable Continuous, Pulse-Skipping, or Low Ripple Burst Mode Operation at Light Loads n Very Low Buck Dropout Operation: 99% Duty Cycle n Low Shutdown IQ: 1.5μA n Small 38-Lead 5mm × 7mm QFN Package n AEC-Q100 Automotive Qualification in Process n Automotive and Transportation n Industrial n Military/Avionics LTC7817 Response to a Cold Crank Automotive Waveform 0.1µF 1.4µH 1.5m 0.1µF 0.1µF 0.9µH 2m 22µF 330µF 22µF 150µF 150µF 0.1µF 1.8µH 3m 357k 68.1k 7817 TA01a 10µF 330µF 210k 68.1k 4.7µF 1V TO 38V STARTUP ABOVE 5V LTC7817 VBIAS RUN1,2,3 SW3 BG3 TG3 BOOST3 SENSE3+ VFB3 ITH1,2,3 TRACK/SS1,2,3 SENSE3– SW1 BG1 TG1 BOOST1 SENSE1+ VFB1 SENSE1– VIN 3.3V VOUT1 12A VOUT3 REGULATED TO 10V WHEN VIN < 10V SW2 BG2 TG2 BOOST2 SENSE2+ VFB2 SENSE2– EXTVCC VOUT2 5V VOUT2 10A INTVCC BOOST1,2,3 FREQ PLLIN/MODE VPRG3 VOUT3 FOLLOWS VIN WHEN VIN > 10V VOUT3 SGND PGND VOUT3 VOUT2 VOUT1 VBATT TIME (10ms/DIV) 0V VOLTAGE 2V/DIV Automotive Waveform LTC7818 Response to a Cold Crank 7817 TA01b |
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